EP 0038715 B1 19921014 - CIRCUIT PROTECTION DEVICES
Title (en)
CIRCUIT PROTECTION DEVICES
Publication
Application
Priority
US 14198780 A 19800421
Abstract (en)
[origin: EP0038715A1] The invention relates to circuit protection devices which comprise conductive polymer PTC elements. The devices of the invention will provide repeated protection against sudden increases in current to high levels, e.g. 5 amps or more, in circuits which operate at, or are subject to fault conditions arising from, voltages greater than 100 volts, e.g. mains supply voltages. A particularly valuable use of the devices is in the protection of circuitry in telecommunication apparatus which normally operates at battery voltages, e.g. up to 75 volts, but which can be accidentally subject to voltages above 120 volts.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
H01C 7/027 (2013.01 - EP US); H02H 9/026 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR IT LI NL SE
DOCDB simple family (publication)
EP 0038715 A1 19811028; EP 0038715 B1 19921014; AT E81564 T1 19921015; CA 1177527 A 19841106; DE 3177291 D1 19921119; DE 3177291 T2 19930519; GB 2074377 A 19811028; GB 2074377 B 19840711; HK 82689 A 19891027; JP H0340481 B2 19910619; JP S56160005 A 19811209; MY 8700777 A 19871231; SG 57987 G 19871113; US 4413301 A 19831101
DOCDB simple family (application)
EP 81301766 A 19810421; AT 81301766 T 19810421; CA 375795 A 19810421; DE 3177291 T 19810421; GB 8112312 A 19810421; HK 82689 A 19891019; JP 6053981 A 19810421; MY 8700777 A 19871230; SG 57987 A 19870710; US 14198780 A 19800421